I found the SimpleDialogCustomizer project, it "help" us the users to develop our own customizers. I edited the customizer code using Visual Studio Community 2017, i remove everything and keep the label1 element.

The first edition i did was deleting one of the images of the customizer, then pressed Build ans Attach customizer and the customizer no longer showed the image, so it was "successfull".

After that i deleted all the other elements on the customizer (kept the label1) and couldn't get the customizer updated on Creator.

I need the button Build and Attach customizer to be available, that's the only way i saw the customizer being updated, may be the old customizer is cached, the design changes i did on VS are not being reflected on the customizer after build.

You can try deleting the precompiled Component customizer assembly (named _project_.dll - SimpleDialogCustomizer.dll) from the project (but not from disk -- it is open, and the delete from disk will fail).Refer component_author_guide "8.2 Precompiled Component Customizers"